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    <meta charset="UTF-8">
    <title>代码-CodeDemo</title>
    <link rel="stylesheet" href="../css/bootstrap.min.css">
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    <div class="container">
        <!-- Code -->
        1.内联代码<br>
        For example <code>&lt;section&gt;</code> as inline;
        <br>2.用户输入<br>
        执行<kbd>cmd</kbd>命令
        <br>3.代码块<br>
        <pre>This is the code.</pre>
        4.变量（数学字符）<br>
        <var> x </var> = <var> y </var> + <var> z </var>
        <br>5.程序输出<br>
        <samp>hello word!</samp>
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